#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
	int a = 0, b = 0, c = 0;
	scanf("%d %d", a, b);
	c = a % b;
	while (c != 0)
	{
		b = c;
		a = b;
		c = a % b;
	}

	return 0;
}